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SECURITY ADVISORIES
Nov 22, 2021
Microsoft Exchange Vulnerability - CVE-2021-42321
THE THREAT eSentire has identified publicly available Proof-of-Concept (PoC) exploit code, for the critical Microsoft Exchange vulnerability CVE-2021-42321. CVE-2021-42321 was announced as part of Microsoft’s November Patch Tuesday release. Exploitation would allow a remote threat actor, with previous authentication, to execute code on vulnerable servers. Prior to the patch release, Microsoft…
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Oct 28, 2021
Telarus and eSentire Expand Partnership to Safeguard Enterprises Globally Against Business Disrupting Ransomware and Zero-Day Attacks
London, UK and Sydney, Australia– Oct. 28, 2021 - eSentire, recognized globally as the Authority in Managed Detection and Response (MDR), today announces the expansion of its partnership with Telarus, the largest privately-held distributor of business cloud infrastructure and contact centre services. Building on their mutual success across North America, Telarus will bring eSentire’s Managed…
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Security advisories — Feb 26, 2019

“Logjam” TLS Vulnerability

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A vulnerability recently exposed in Diffie-Hellman key exchange for TLS is potentially serious. However, it can be mitigated by doing the following on all of your TLS/SSL enabled systems:

Due to the nature of this vulnerability, we do not currently have signatures for detecting an exploit attempt in progress. However, we are actively researching methods of detection that can be rolled out to our sensors.

What We Know

The mechanics of this exploit require Man-in-the-Middle access to the network between the client and server, which makes the largest potential threat either internal users or outside users accessing an insecure network.

Affected known Protocols (TLS):

The below post on the Logjam attack outlines the configuration changes needed to generate a unique 2048-bit Diffie-Hellman group on common servers applications and will allow Server Test for HTTPS web servers.
https://weakdh.org/sysadmin.html (Site experiencing heavy load)

eSentire Defenses

eSentire has confirmed that our internal systems and the sensors deployed at client sites are protected against this threat. Current eSentire Continuous Vulnerability Service subscribers will receive in their next monthly report the details of any systems vulnerable to this attack.

Further Protection

How to further protect yourself from these (and other) emerging threats:

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